Mr. P. E. Chase on Gravity and Magnetic Inclination, 333 



II. Dip. 



8. The lines of equal dip are arranged in approximate parallels 

 around the two (principal) magnetic poles. 



9. In consequence of this parallelism they are convex toward 

 the north in the Pacific Ocean, and toward the south in the 

 Atlantic Ocean. 



10. The magnetic parallels also approximate to the isothermal 

 parallels, both in direction and in position, but with some im- 

 portant departures. 



11. In South America the magnetic equator is depressed 

 nearly 30° south of the isothermal equator; it is, however, 

 nearly equidistant from the (principal) north and south magnetic 

 poles. 



12. The magnetic parallels near the magnetic poles are more 

 convex than the isothermal lines, but they present some inter- 

 esting instances of parallelism to the ocean-currents, which are 

 indisputably gravitation-currents. 



13. This parallelism is specially observable in the regions of 

 the equatorial currents, the Gulf- stream, and the North Pacific 

 and Japan currents. 



14. If a series of waves were propagated through the air from 

 the magnetic poles to the equator, with slight deflections by the 

 continental contours and ocean currents, they could be represented 

 with great accuracy by the magnetic parallels. 



All of the foregoing modifications, as well as the theoretical 

 phenomena previously referred to, have their exact counterparts 

 in the currents which tend to restore the gravitation-equilibrium 

 of the air and water. It may be unwise, ignorant as we are of 

 the true nature of causal efficiency, to assert that one form of 

 force is produced by another, but it is one of the most important 

 duties of true philosophy to observe sequences and correlations. 

 It has long been known that magnetic action may be so directed 

 as either to assist or counteract the attractions of cohesion, che- 

 mical affinity, and gravitation : it has also been known that, under 

 certain circumstances, disturbances of chemical or of cohesive 

 attraction are accompanied by magnetieal disturbances*; but I 

 have now shown for the first time, by independent examinations 

 of the total force, declination, and dip, that disturbances of gra- 

 vitation are similarly attended. 



* " A few years ago magnetism was to us an occult power, affecting only 

 a few bodies; now it is found to influence all bodies, and to possess the 

 most intimate relations with electricity, heat, chemical action, light, crys- 

 tallization, and, through it, with the forces concerned in cohesion ; and we 

 may, in the present state of things, well feel urged to continue our labours, 

 encouraged by the hope of bringing it into a bond of union with gravity 

 itself." (Faraday, ' Experimental Researches/ 2614.) 



